Improvement in sectional steam-generators



- 2 Sheets--She-et1. AD. BENISHAW.

Sectional Steam-Generators. No.4 143,842'. jgj Patentedocnzmsvs.

Sheet 21..

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Patented ocr. 21,1873.

UNITEDV STATES PATENT OFFICE.

DAvID EENs'EAw, 0E PHILADELPHIA, PENNsYDvA'NIA IMPROVEMENT IN SECTIONALSTEM-GENERATORS.

Specification forming part of Letters Patent No. 143,842, dated October 21, 18773 application filed February 4, 1873.

To alt/whom it may concer-n:

Be it known that I, DAVID RENsnAw, of Philadelphia, in the county of PhiladelphiaJ and State of Pennsylvania, haveinvented certain new and `useful Improvements in Sectional Steam-Generators; and I do hereby declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

Referring to the drawings, Figures'l and 3 are front elevations and 'partial sections of my invention. Fig. 2 is a vertical longitudinal section of theI same, and Fig. 4 is a detail view.

This invention relates to the construction of sectional steam-generators, the sections being cast in a single piece, and forming a part of the fire-chamber or reverberatory furnace. TheV invention consists in the con` struction and combination of the upper .parts of said generator, and of a pipe-base for the equal delivery of waterto said upper section, and to furnish ready and efficient cleaning facilities.

The upper part of the furnace is constructed generally in accordance with my patent of December 24, 1872`that isl to say, of hollow flat pipe sections, (which may, however, be round,) stay bolted, and communicating, by suitable openings, with the base, and with a steam-drum placed above the furnace. The base of the furnace in the patent referred to consists of wide cast-metal sections, stay-bolted, and so constructed as to form allaring top to the fire-chamber. In the present case I substitute for these broad sections a round metal pipe of suitable dimensions, saidpipe being located directly beneath the upper sections, with which it communicates, as hereinafter described, and having flanges of the same width as the said upper sections. rIhe base-pipe extends around the four sides of the furnace, the corners being turned by means of suitable elbows, and provision .being made for the furnace-door by means of an arch-pipe flanged to the pipebase, so as to form a continuous water-body around the entire generator. The internal generators are composed of a series of curved pipes or dat sections, cast with, and forming a part of, the flat pipes which make the side walls of the reverberatory furnace; thus dif- Referring to the drawing, A shows a rever beratory furnace, the crown, front and rear walls of which are formed of cast-metal sectional pipes A', dat or round, stay-bolted when made' flat, and secured together by flanges and bolts, substantially as in my patent above referred to., The base is shown at B, extending from the lower line b of the furnace to the flangeg'oint b1. This base-pipe eX- tends, as suggested, around the four sides of the furnace, the corners being turned by means of elbows b2, iianged and bolted, as seen. An arched section is shown at b3, forming a doorway to the fire-chamber. A iue is shown at C, in the rear of the furnace. Dis the grate, which extends from side to side, and fromthe front to the rear of the furnace, giving thereby the entire base of the structure as grate-area, this being necessary from the large amount of liresurface exposed in so small a space. The internal sections are shown at E, consisting either of a series of arched pipes, as shown in Fig. 1, or of flat stay-bolted sections, as in Fig. 3.

I have called these internalsections because they are located inside the furnace, and are suspended, as it were, between the grate and roof thereof; but they are not separate from the walls, being cast in one piece therewith, each section, accordingly, of the vupper part of the furnace consisting of a portion of the wall or side and an internal section. The outer portions Vof these sections are formed with projections a, which enable the molder to get out his cores, and, at the same time, give cleaning facilities unequaled in any other construction. Theprojections a are closed by caps. The projections a connect with the steamdrum in the manner shown. G is the steamdrum, provided with gage-cocks g g. The feed and blow-oif pipes are shown, respectively, at h and h.

Among other advantages of a steam-generatorthus constructed will be observed the following: The base being formed of a round pipe, it brings the connecting joint or joints between it and the side sections to alow point, and hence permits the internal sections to be lengthened correspondingly. The sections E communicating directly, as indicated, with the hollow walls of the furnace, there is an upward circulationin said internal sections, and a downward circulation in the walls, carrying down the sediment to the water -legs or base B, whence it can be readily removed through the hand-holes shown. The sections forming the wall and the internal sections being cast in one piece, instead of separately, eii'ect a saving in manufacture, as it makes alarge deduction in the amount of machine-work or fitting necessary in construction. A still further advantage is, that direct access can be had, for cleaning purposes, to thc interior sections E by removing the caps a.

What I claimv is- The combination of the base B, the sections A E, made with the proj ections and caps a, and the steam-drum G, placed outside, substantially as shown.

' In testimony that I claim the foregoing I have hereunto set my hand this 22d day of January, 1873.

DAVID RENSHAW. Witnesses: Y

M. DANL. CoNNoLLY, Tnos. A. CoNNoLLY. 

